PINPOINT® Nitrate Monitor User's Guide

1. Pour 10 ppm Nitrate Calibration Fluid into the storage bottle to the fill line. Insert the end of the probe into the fluid and screw the top onto the bottle. Check the flat probe tip is not resting on the bottom of the bottle.
2. Slide the Range Switch to the HIGH position
3. Press and release the ON/OFF button to power on the monitor.
4. Press and release the Calibrate button. “CAL” will appear on the display and the number 10 will flash slowly for about 40 seconds.
5. When the number 100 starts to flash rapidly, the meter is ready for the 100 ppm fluid. Don’t rush; you have as much time as you need. Unscrew the bottle and return the 10 ppm calibration fluid back into its original bottle. Pour 100 ppm nitrate calibration fluid into the storage bottle to the fill line. Insert the end of the probe into the fluid and attach the bottle.
6. Press and release the Calibrate button. The number 100 will flash slowly for about 40 seconds. When the flashing stops the meter is fully calibrated for the HIGH Range. Pour the 100 ppm calibration fluid back into the original container.
7. Pour a water sample to the fill line on the storage bottle and insert the probe to determine the exact Nitrate level. Allow up to one minute for the reading to stabilize. When finished, rinse the probe with R/O or deionized water and blot dry with a paper towel prior to storage.

Low Range Calibration ( 1 ppm to 10 ppm)

1. Pour 1 ppm Nitrate Calibration Fluid into the storage bottle to the fill line. Insert the end of the probe into the fluid and screw the top onto the bottle. Check the flat probe tip is not resting on the bottom of the bottle.
2. Slide the Range Switch to the LOW position
3. Press and release the ON/OFF button to power on the monitor.
4. Press and release the Calibrate button. “CAL” will appear on the display and the number 1 will flash slowly for about 40 seconds.
5. When the number 10 starts to flash rapidly, the meter is ready for the 10 ppm fluid. Don’t rush; you have as much time as you need. Unscrew the bottle and return the 1 ppm calibration fluid back into its original bottle. Pour 10 ppm nitrate calibration fluid into the storage bottle to the fill line. Insert the end of the probe into the fluid and screw the top onto the bottle.
6. Press and release the Calibrate button. The number 10 will flash slowly for about 40 seconds. When the flashing stops the meter is fully calibrated for the LOW Range. Pour the 10 ppm calibration fluid back into the original container.
7. Pour a water sample to the fill line on the storage bottle and insert the probe to determine the exact Nitrate level. Allow up to one minute for the reading to stabilize. When finished, Rinse probe with RO or deionized water and blot dry with a paper towel prior to storage.

Important Points to Remember

• PINPOINT® Nitrate Monitor has been designed as a high precision spot-testing monitor. Continuous Nitrate Monitoring may not always be possible and may require more frequent recalibration and probe replacement.
• PINPOINT® Nitrate Monitor is NOT waterproof and must be operated on a dry surface. Liquid contact with the printed circuit board may cause corrosion and void warranty.
• PINPOINT® Nitrate Monitor has 2 independent ranges:
  0 – 10 ppm NO3-N (nitrate-nitrogen)
  10–100 ppm NO3-N (nitrate-nitrogen)
• Accuracy for either scale after calibration is +/- 1 ppm NO3-N (nitrate-nitrogen)
• Resolution for either scale is 1 ppm NO3-N (nitrate-nitrogen)
• When the probe is not in use, the tip should be stored in the protective bottle (dry). That is with NO fluid added to the bottle. A properly stored probe may have a life up to 2–3years.
• For greatest accuracy all calibration and sample fluids should be at (the same) room temperature.
• The Nitrate Meter will always store the last calibration even when the power is turned off.
• PINPOINT® Nitrate Probe should be kept very clean. Rinse off the probe tip with RO/DI water prior to storage. Do not use any cleaning fluids or chemicals.
• Calibration fluids can be reused and should be replaced occasionally. Calibration Fluid replacement will depend on individual technique and be indicated by the inability to calibrate.
• For increased stability allow the probe tip to soak in calibration fluid for a minute or so before calibration.
• There are several possibilities for the meter to display Er…P during the calibration process:
  1-The probe BNC is not connected to the meter.
  2-The probe membrane is very dry (common with a new probe). Soak the probe tip in both 10 ppm or 100 ppm calibration fluid for 60 minutes each fluid. Recalibrate.
  3-The probe has reached the end of its useful life
• Lo on the display indicates the probe is measuring a nitrate value below the selected scale.
• High on the display indicates the probe is measuring a nitrate value above the selected scale.